Cirsium vulgare

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Native to Eurasia, Cirsium vulgare is the only thistle in North America with

       bristlelike spines borne on the adaxial leaf faces. These structures are variously described
       in the literature as trichomes (“spreading hirsute,” “scabrous-hispid,” “coarsely hispid,”
       “rigid, rather pungent setae,” “prickly-hairy”), prickles, or spines (“setose-spinulose,”
       “appressed and dense spines”). My examination of cleared leaves of C. vulgare indicated that
       these structures are not epidermal outgrowths (trichomes or prickles) but emerge from fine
       veinlets within the tissues of the leaf. As such, they are properly treated as
       spines.
Facts about "Cirsium vulgare"
apex arrangementradiating +
apex colorationgreenish +
apex prominence or shapeflat +
apex shapeserrulate +
array architecturecorymbiform + and paniculiform +
base architecturewinged-petiolate + and sessile +
base arrangementdistributed +
base colorationstramineous +
base otherprincipal +
base positioncauline +, mid +, distal + and distal cauline +
base shapetapered +, decurrent + and lobed than proximal +
base sizereduced +
blade shapeoblong-lanceolate + and obovate +
branch external texturevillous +
branch orientationascending +
chromosome count68 +
collar variabilitydifferentiated +
corolla colorationpurple + and white +
cypsela colorationbrown +
face colorationgreen +
face countbasal + and absent +
face external texturegray-tomentose +, villous + and tomentose +
face positionadaxial +
flowering timesummerjun +, jul +, aug +, sep +, year round +, summer +, spring +, winter +, fall +, nov +, apr +, dec +, jan +, jun +, oct +, may +, feb + and mar +
habitatinvasive weed of disturbed sites , pastures , meadows , forest openings , roadsides +
involucre external texturearachnoid-tomentose +
involucre shapehemispheric + and campanulate +
lobe architecture or shapespiny +
lobe arrangementdivergent +
lobe shapetriangular +, lanceolate +, entire + and spiny-dentate +
margin architecture or shapespinulose +
margin shapeplane +, revolute +, 1-2-pinnatifid +, spinose-dentate + and entire +
petiole architecturewinged +
petiole life stageflowering +
phyllary arrangementimbricate +
phyllary orientationappressed +
phyllary positionouter + and middle +
phyllary shapelinear-lanceolate + and linear +
spine architecturebristlelike +
spine height or lengthshort +
spine orientationappressed +
stem orientationerect + and ascending +
streak colorationdarker +
trichome architectureseptate +
whole organism life stylebiennial +
wing architecture or shapespiny +
wing lengthlong +